Universal milling attachment.



G. G.PORTER & I. E. CABLE.

UNIVERSAL MILLING ATTACHMENT.

APPLICATION FILED MAR-22. 1909.

Patented Dec. 21,1909.

3 SHEETS-SHEET 1.

G. G. PORTER & I. E. CABLE.

UNIVERSAL MILLING ATTACHMENT.

APPLIOATION FILED 1515.11.22. 1909.

943,845. Patented Dec.21, 1909.

3 SHEETS-SHEET 2.

Li L. i! Lil a'nue'ntow (was v flttormwz G. G. PORTER & P. E. CABLE.

UNIVERSAL MILLING ATTACHMENT.

APPLICATION FILED MAR. 22. 1909.

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UNTTED STATES PATENT OFFICE.

GEORGE G. PORTER AND FRANK E. CABLE, 0F SYRACUSE, NEW YORK, ASSIGNORS TOTHE PORTER-CABLE MACHINE COMPANY, OF SYRACUSE, NEW YORK, A CORPORA- TIONOF NEW YORK.

UNIVERSAL MILLING ATTACHMENT.

Specification of Letters Patent.

Application filed March 22, 1909.

Patented Dec. 21, 1909.

Serial No. 485,101.

T 0 all whom it may concern:

Be it known that we, Gnonon G. Pon'rnn and F RANK E. CABLE, citizens ofthe United States, residing at Syracuse, in the county of Onondaga andState of New York, have invented certain new and useful Improvements inUniversal Millin Attachments, of which the following is a specification.

Our present invention pertains to universal milling attachments adaptedfor use in conjunction with the ordinary standard milling machines nowupon the market, the construction and advantages of whichattttClllIlQllt will be hereinafter set forth, reference being had tothe annexed drawings, wherein Figure 1 is a side elevation of theattachment shown as applied to a milling machine; Fig. 2 a horizontalsectional view, taken on the line 2-2 of Fig. 1; Fig. 3 a longitudinalvertical sectional view of the device; Fig. +t a like view, taken on theline -ld of Fig. 1; Fig. 5 a similar view, taken on the line 5 5 of Fig.3; Fig. 6 a detail view of the lower portion of the combined clampingand supporting member which carries the bearing for the outer end of thearbor or shaft; Fig. 7 a detail perspective view of a portion of thehead; and Fig. 8 a detail view showing a modified form of the clampingmember.

The main object of the invention is to provide a milling attachmentwhich may be secured to any standard milling machine, the attachmentpermitting the use of small mills which may be operated at a high speed.The construction is such that any angle in the work may be. reached andthe position of the cutter readily changed and accurately adjusted. Thecombined supporting and clamping member permits of the attachment beingused on different sizes and makes of machines, and furthermore, the factthat the tool is belt-driven prevents breakage of the parts should thetool become cramped and,

by reason of the belt-tightener which is employed, permits the belt tobe adjusted to the proper tension in accordance with the size andstrength of the tool being used. In other words, it provides anadjustable friction drive.

\Vith these and other advantages in view, a detailed description of theinvention will be given.

Referring to the construction shown in Figs. 1 to 7, inclusive, 1denotes the overhanging arm of the usual milling machine and 2 the maindriving spindle of said machine which, as shown in Fig. 3, is providedwith a tapered socket adapted to receive the tapered end of a drivingarbor 3, and to impart motion thereto. Said arbor finds its bearings insleeves 1 and 5 mounted in a frame or housing 6, the outer end of whichpasses into a split boss 7 formed upon the lower end of a slide 8. Theframe, adjacent to the boss, is formed with a collar 9, and the boss isprovided with two bolts 10 by which it may be clamped upon the frameafter said frame has been brought to its desired adjusted position withreference to the boss. The slide 8 is mounted between twodownwardly-extending arms 11 and 12 which are formed integral with abearing-block 13 which is provided with a V in its upper face adapted tobear against the overhanging arm 1 when the parts are positioned.

A flexible strap 14, preferably machined from solid, cold-rolled steel,is employed to secure the bearing-block 13 to the overhanging arm 1.Said st up, as will best be seen upon reference to Fig. 1, is providedat one end with a block 1 1 through which a series of holes is formed,while the opposite end is provided with a threaded stem 15 which passesbetween the ears or lugs 16 extending outwardly from the bearing block.A washer 15 is passed upon the threaded end and a nut underlying saidwasher forces the washer upwardly into a recess formed in the lugs bythe provision of grooves or cutaway portions 16. This constructioninsures the proper seatmg of the parts. By

the employment of the threaded stem 1.) and the block 1 1-, with thevarious openings or holes formed therein, the bearing-block 13 may bereadily secured to the overhanging arm 1 of any machine, said arms inpractice varying with different machines. The construction givessuflicient range to meet the requirements of all commercial machines nowin use.

The depending arms 11 and 12 are provided with oppositely disposed slotsthrough which pass bolts 17 and 18, said bolts likewise extendingthrough the slide 8. By tightening the nuts 19, mounted upon the bolts,the slide may be secured in its adjusted position with relation to thearms or to the supporting frame composed of the arms, the bearing-blockand the clamping member or strap H.

From this it will be seen that this device may be adapted to machines ofvarious sizes in which the center distance between the overhanging armand the spindle varies, and also to machines wherein the sizes ofdiameters of the overhanging arms vary.

It will be understood that the arbor 3 is properly alined with thespindle after which the supporting frame is secured in position, thusmaintaining such alinement and preventing vibration of the parts.

In Fig. 8 is shown a slightly modified form of the clamp for securingthe supporting frame to the overhanging arm. The member 13 correspondsto the member 13 in the other construction and its ears are threaded anddesigned to receive the threaded ends of bolts 45, which bolts passthrough a yoke 46 which overlies the arm. By tightening up the bolts theparts will be securely clamped to the overhanging arm. This constructiondoes not, however, permit such a wide range of adjustment as may be hadwith that shown in the other figures, which is the preferred form.

The constructions above set forth form what may be termed an adjustablesupporting member.

Secured to the arbor 3 adjacent to the spindle is a bevel-gear 20 whichgear in turn meshes with a somewhat smaller gear 21 fixed upon theextended hub 22 of a beltpulley 23, the hub finding its bearing upon afixed shaft or arm 2st secured in a lug or boss 25 formed as an integralportion of the frame 6.

A shaft 26, see Fig. 5, finds its hearings in bushings 27 mounted on theframe 6 and a boss or lateral extension 28 thereof, said shaft havingsecured to its outer end a beltpulley 29. An endless belt 30 passesaround said pulley 29, the pulley 23 and beneath an idler 31, whichlatter is mounted upon the outer end of an arm 32, said arm extendingoutwardly from a split bushing 33 which encircles the outer end of theboss or extension 28 and is clamped thereon when brought to suchposition that the belt 30 is given the desired tension, according to thesize of the tool being employed.

The frame 6 is formed with what may be termed a bearing plate orsupporting member 34, which encircles or surrounds the shaft 26 and isfaced off to receive the corresponding face of the head in which latterthe socket for the tool is mounted. Said head, as will be seen uponreference to Figs. 3, 5 and 7 is provided with an under cut T-shapedslot 36, adapted to receive the heads 37 of the bolts 38, two of whichlatter pass through the bearing-plate 3st, while the upper or thirdbolt, as seen upon reference to Fig. 5, passes through the main body ofthe frame 6. By tightening the nuts upon these bolts the head will besecurely clamped to the supporting plate, but the arrangement is suchthat when the bolts are loosened the head may be rotated with referenceto the supporting-plate so as to secure any desired adjustment of thehead, and consequently of the milling tool 39 which is mounted in thetool-socket 40 carried by the head. Rotary motion is imparted to thesocket by a bevel-gear l1 which is secured to the socket, to whichmotion is given by a similar gear 42 secured to the inner end of theshaft 26. In order that the T-heads 37 of the bolts may pass into theslot 36, a T-shaped opening e3 (Figs. 3 and 7) is formed in the wall ofthe head, which opening connects with the slot 36.

The head as will be seen upon reference to Fig. 2, is provided with aseries of graduations, from 0 to 90, in opposite directions from amedial point, which graduations may be read in conjunction with a mark hupon the frame 6, or the bearingplate 3% thereof. By loosening the bolts38 the head may be adjusted in any position about the axis of the shaft26 in a plane parallel to the main driving arbor, 3.

The collar 9, as will be noted upon reference to F igs. 2 and 6, islikewise provided with a series of graduations from 0 to 90 in eachdirection and said graduations are adapted to be read in conjunctionwith a zero mark (see Fig. 6) formed upon the split boss 7.

By loosening the bolts 10 the frame 6 may be swung about the maindriving arbor 3 and the milling tool brought to any position or relationdesired with reference to said arbor or to the work. By having these twoadjustments in planes at right angles to each other, a universaladjustment of the tool may be effected and the tool brought to anydesired or necessary position and there clamped, and this without in anymanner affecting the driving mechanism which, as will be noted, iscarried by the main frame 6, with the exception of the bevel-gear 20,which is secured to the arbor 3, and with which the bevel-gear 21 willalways mesh.

It will, of course, be understood that when placing the machine upon themarket the tapered end of the arbor 3 will be formed to meet any specialrequirement, or the taper will be made of a standard size and theconnection between the spindle and the arbor efiected by taperedbushings, which are commonly employed in machines of this character.

It will be noted that with the gearing as shown the tool may be drivenat a very high speed, which speed, of course, may be varied bysubstituting gears or pulleys of different sizes.

Should the tool become bound or cramp in the work it will, as beforenoted, simply come to rest and the belt will slip so that none of theparts will be subjected to undue strain and consequently no breakagewill take place.

Having thus described our invention what we claim is:

I. In combination with a frame; an arbor rotatably mounted therein andprovided at one end with means to connect it to or with the spindle of amilling machine; an ad jnstable member adapted to be secured to theoverhanging arm of the machine for supporting the frame aforesaid; atoolholder carried by the frame; and a driving mechanism for saidtool-holder.

In combination with a frame; an arbor rotatably mounted therein andprovided at one end with means to connect it to or with the spindle of amilling machine; an adjustable supporting and clamping member at theouter end of the frame adapted to be secured to the overhanging arm ofthe milling machine and to hold said frame in its adjusted position; atool-holder supported by the frame; and means carried by the frame forimparting motion from the arbor to the tool-holder.

In combination with a frame; an arbor rotatably mounted therein andprovided at one end with means to connect it to or with the spindle of amilling machine; an adjustable supporting member for the frame adaptedto be secured to the overhanging arm of the machine said frame beingadjustable about its axis within the supporting member; a tool-holdersupported by the frame; and means carried by the frame for impartingmotion from the arbor to the tool-holder.

4. In combination with a frame; an arbor rotatably mounted therein andadapted to e connected to the spindle of a milling machine; anextensible supporting member for one "end of the frame; means forclampingthe same to the overhanging arm of the milling machine; atool-holder; means for securing a universal adjustment of the same; andmeans for rotating the tool-holder.

In combination with a frame; an arbor rotatably mounted therein andadapted to be connected to the spindle of a milling machine; anadjustable supporting member for the outer end of the frame, the framebeing adjustable about its axis in said member; adjustable means forsecuring the support ing member to the overhanging arm of the millingmachine; a tool-holder adjustably mounted on the frame; the planethrough which the adjustment may be made being at right angles to theaxial adjustment of the frame; and means actuated from the arbor forrotating the tool-holder.

G. In combination with a frame; an arbor rotatably mounted therein andadapted to be connected at one end to the spindle of a milling machine;adjustable means for sup- ;orting the outer end of the frame; a headadjustably mounted on the frame; a toolholder rotatably mounted in saidhead; and means for rotating said holder from the arbor.

T. In combination with a frame; an arbor rotatably mounted therein andadapted to be connected at one end to the spindle of a, milling machine;a tool supported by the frame and having a universal adjustment; andfrictionally-actuated driving mechanism between the shaft and the tool.

8. In con'ibination with a frame; an arbor rotatably mounted therein andadapted to be connected at one end to the spindle of a milling machine;an extensible supporting membe' adjustably secured to the outer end ofthe frame; means for securing said memher to the overhanging arm of themilling machine; a countershaft carried by the. frame; a head adjustablymounted upon the frame in line with the counter-shaft; a toolholdermounted in the head: gearing inter posed between the counter-shaft andthe toolholder; and belt-actuated driving mechanism between the arborand counter-shaft.

9. In combination with a frame; an arbor rotatably mounted therein andadapted to be connected at one end to the spindle of a milling machine;a slide provided with a split bushing in which the frame is held and maybe rotated to secure axial adjustment; means for clamping the bushing onthe frame; a member adapted to be clamped to the overhanging arm of then'iilling machine; means for securing said member to the slide; abearing plate formed upon the frame; a head adjustably secured upon theplate; a toolholder mounted in the head; a counter-shaft mounted in theframe; gearing interposed between one end of said shaft and thetoolholdcr; a belt-pulley mounted upon the opposite end of the shaft; asecond belt pulley mounted on the frame; gearing actuated by the arborfor rotating said second pulley; a belt passing about the pulleys; and atension device acting on the belt.

10. In combination with a frame; an arbor rotatably mounted therein andprovided with means for connecting the same with or to the spindle of amilling machine; a tool supported by the frame; driving connectionsbetween said tool and the arbor; a support.- ing member for the outerend of the fram and a flexible strap adjustably secured to the upperportion of the frame and adapted to embrace the overhanging arm of themilling machine and to clamp the frame thereto.

11. In combination with a frame; an arbor rotatably mounted therein andadapted to be connected at one end to the spindle of a milling machine;an adjustable supporting memher at the outer end of the frame; aflexible strap provided with a head having a series of holes therein andat its opposite end with a threaded stem; means for connecting the headto one side of the adjustable supporting member; means for securing thethreaded stem to the opposite side of said member, whereby the strap maybe caused to embrace the overhanging arm of the milling machine and toclamp the supporting member thereto; a tool-holder supported by theframe; and means for imparting motion to said tool-holder.

12. In combination with a frame; an arbor rotatably mounted therein andadapted to be connected at one end to the spindle of a milling machine;a tool-holder carried by the frame; means for imparting motion to saidtool-holder; an adjustable supporting member at the outer end of theframe adapted to bear at its upper end against the under face of theoverhanging arm of the milling machine; a pair of ears extendingoutwardly from one side of said member, the under face of said earsbeing recessed;.a flexible strap provided with a head at one end, havinga series of openings therein; a bolt passing through one of saidopenings and connecting the head to the upper portion of the supportingmember; a threaded stem formed upon the opposite end of the strap, saidstem being adapted to pass between the ears afore, said; a sphericalwasher mount-ed upon the stem and adapted, when the strap is drawntightly around the overhanging arm of the milling machine, to bear inthe recessed portion of the ears; and a nut mounted upon the threadedportion below the washer.

13, In a machine of the character specified, the combination of adriving shaft; means for securing a driving connection between the shaftand the spindle of a milling machine; a supporting frame for said shaft,said frame being axially adjustable about the shaft; means forsupporting said frame in its axially adjusted position and holding thedriving shaft in alinement with the spindle; a toolholder adjustablymounted on the frame, the plane of adjustment being at right angles tothe axis of the driving shaft, whereby a universal adjustment of thetool may be had; and driving connections between said shaft and thetool-holder.

14. In a machine of the character specified, the combination of adriving shaft or arbor; means for securing a driving connection betweenthe shaft and the spindle of a milling machine; a supporting frame forsaid shaft, the frame being axially adjustable about the shaft; meansfor supporting i I 1 l said frame in its axially adjusted position andholding the driving shaft in alinement with the spindle; a tool -holdermounted upon the frame, said holder being adjustable in a plane at rightangles to the axis of the driving shaft, whereby a universal adjustmentof the tool may be had; a gear mounted upon the driving shaft androtatable at all times therewith; and driving connections between saidgear and the tool, said connections being carried by the frame andmovable therewith.

15. In a machine of the character speci fled, the combination of anarbor; means for effecting a driving connection between said arbor andthe spindle of a milling machine; a frame for supporting said arbor, theframe being rotatable for adjustment about the axis of the arbor; meansfor holding and supporting said frame in its axially adjusted position;a tool-holder carried by the frame; and means for driving thetool-holder.

16. In a machine of the character speci fied, the combination of anarbor; means for effecting a driving connection between said arbor andthe spindle of a milling machine; a frame for supporting said arbor, theframe being rotatable for adjustment about the axis of the arbor; meansfor holding and.

supporting said frame in its axially adjusted position; a tool-holdercarried by the frame; a gear secured to and driven by the arbor; asecond gear mounted upon the frame and meshing with the gear aforesaid;and an ad justable friction drive interposed between the gear upon theframe and the tool-holder.

17 In a machine of the character specified, the combination of an arbor;means for effecting a driving connection between said arbor and thespindle of a milling machine; a frame for supporting said arbor, theframe being rotatable for adjustment about the axis of the arbor; meansfor holding and supporting said frame in its axially adjusted position;a tool-holder carried by the frame, said holder being adjustable in aplane par allel with the axis of the arbor; a gear secured to and drivenby the arbor; a second gear mounted upon the frame and meshing with thegear aforesaid; and an adjustable friction drive interposed between thegear upon the frame and the tool-holder.

In testimony whereof we have signed our names to this specification 1nthe presence of two subscribing witnesses.

GEORGE G. PORTER. FRANK E. CABLE. lVitnesses GEORGE IV. GRAY, E' L.IVILDMAN.

